You again! Hello!!
*recalls to the time he spent far too much time thinking this question over.*
*Brain explodes.*
...Just gonna go with Mem and move on. =D
Nightblood. No question.
I just have this image in my mind of Szeth waving around a bright purple Nightblood.
YASS!! ANOTHER CONVERT!!
Really though, I hope you enjoy it! Greenglass House is more of a fireplace read than a fantasy novel read (still absolutely brilliant though, of course.) In terms of raw fantasy I'd probably recommend The Broken Lands.